My practical answer would be, of course, right wing shit, period. It wouldn't stop them but might slow their spread.
My fun/funny/unserious answer would be commission an algorithm to monitor Reddit so I don't have to that keeps track of exceedingly popular passive-aggressive and smug ways to start and end sentences and takes the top percentiles of them and makes them the shockers of the week. It would make Lemmyverse liberals a lot less redundant as a side effect, too. 
"Umm, I'm sorry, honestly, but let's be honest here. It's almost as if..."
"Wow, vitriol much?"
I would just shock people when they're lying online. That's it.
They can do it to people in person, but no more sock puppets or disingenuous BS on the internet. No more people taking credit or talking about their cousin who for real died from a mote of fentanyl dust.
I felt a great disturbance in the Force, as if millions of debate bros suddenly cried out in terror and were suddenly silenced
As an ND can I petition to extend this policy IRL too because I'm tired of literally every social interaction being confusing and exhausting
It would be so much better. The social games aren't even fun.
Now I have to be honest to my boss? I will be fired instantly.
Your boss has to be honest with everyone now and will likely be torn to pieces by an angry mob before the week is out